Low Substrate Boron Corrective Procedures
Brian E. Whipker, James L. Gibson, Paul V. Nelson, Todd
J. Cavins, and John M. Dole
Disclaimer: Growers should read and follow all label
directions. Test the corrective procedure on a small number of plants
prior to applying it to the entire crop.
|Not using a fertilizer containing boron
(eg. calcium nitrate + potassium nitrate).
1. Use a fertilizer which contains B.
2. Corrective drench application of borax or solubor at 6.25 ppm
of B for soilless substrates. Visible improvements with the use
of the corrective B fertilization will be very slow and it is difficult
to reverse growing point death or distorted leaves. For corrective
application: add 0.75 oz. (21.3 g) of borax (11% B) per 100 gallons
of water or 0.43 oz. (12.2 g) of solubor (20% B) per 100 gallons
of water. Rinse off foliage.
Foliar sprays have a greater risk of plant injury. Avoid applications
during the midday heat. Plant uptake is enhanced by prolonged drying
time, which occurs during humid conditions, especially in the morning.
Nutrient uptake through the leaves is also greater in the day than
at night, making morning applications more desirable than evening
|Little or no boron provided through the irrigation water.
||1. Use a fertilizer that contains B.
|Don't forget to check out the Plant Root Zone Management
(PRZM) Manual for more information! Want to know more? Click
© Copyright NC State University, 2002
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